About 579:
Area code 579 was first put in service August 21, 2010. Currently, the largest city it serves is Granby, QC, and it overlaps coverage areas with area code 450.
Related Cities:
Area codes 450 and 579 serve the many suburbs of Montreal including the communities of Boucherville, Chambly, Joliette, Laval, Longueuil, Varennes, Roussillon, and Saint-Hyacinthe. Montreal is served by 514 and 438